package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 营业额统计
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //1. 查询日期集合
        List<LocalDate> dateList= new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            // 日期加1, 如果begin=end,循环结束
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //2. 查询各个日期对应的营业额
        List<Double> turnoverList= new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额：状态为“已完成”的订单总金额
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //sql: select sum(amount) from orders where order_time > beginTime and order_time < endTime and status = 5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            if (turnover == null){
                turnover=0.0;
            }
            turnoverList.add(turnover);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //1. 查询日期集合
        List<LocalDate> dateList= new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            // 日期加1, 如果begin=end,循环结束
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //2. 用户总量集合 3. 新增用户集合
        List<Integer> totalUserList= new ArrayList<>();
        List<Integer> newUserList= new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("end",endTime);
            //查询date日期对应的用户总数
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);

            map.put("begin",beginTime);
            //查询date日期对应的新增用户数
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        //1. 创建日期集合
        List<LocalDate> dateList= new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            // 日期加1, 如果begin=end,循环结束
            begin=begin.plusDays(1);
            dateList.add(begin);
        }

        //2. 查询各个日期对应的订单总数、有效订单总数
        List<Integer> orderCountList= new ArrayList<>();
        List<Integer> validOrderCountList= new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //订单总数
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            orderCountList.add(orderCount);
            //有效订单总数
            Integer validOrderCount =getOrderCount(beginTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(validOrderCount);
        }
        //3. 计算时间区间内的订单总数量
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //4. 计算时间区间内的有效订单数量
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //5. 计算订单完成率
        Double orderCompletionRate = 0.0;
        if(totalOrderCount!=0){
            orderCompletionRate = validOrderCount/(double)totalOrderCount;
        }

        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 订单统计，抽离的逻辑
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end,  Integer status) {
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }

    /**
     * 销量排名
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1.查数据库，获得营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2.把数据写入excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据统计报表.xlsx");
        try {
            //基于模板文件，导入到我们新创建的工作簿
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格的sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间："+dateBegin + "至" + dateEnd);
            //填充数据--概览数据
            sheet.getRow(3).getCell(2).setCellValue(businessDataVO.getTurnover());
            sheet.getRow(3).getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            sheet.getRow(3).getCell(6).setCellValue(businessDataVO.getNewUsers());
            sheet.getRow(4).getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            sheet.getRow(4).getCell(4).setCellValue(businessDataVO.getUnitPrice());
            //填充数据--明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                sheet.getRow(7 + i).getCell(1).setCellValue(date.toString());
                sheet.getRow(7 + i).getCell(2).setCellValue(businessData.getTurnover());
                sheet.getRow(7 + i).getCell(3).setCellValue(businessData.getValidOrderCount());
                sheet.getRow(7 + i).getCell(4).setCellValue(businessData.getOrderCompletionRate());
                sheet.getRow(7 + i).getCell(5).setCellValue(businessData.getUnitPrice());
                sheet.getRow(7 + i).getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3.通过输出流将excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //4.关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
